.c-fff {
    color: #fff;
}

.c-ccc {
    color: #ccc;
}

.c-000 {
    color: #000;
}

.c-333 {
    color: #333;
}

.c-666 {
    color: #666;
}

.c-999 {
    color: #999;
}

.bg-fff {
    background-color: #fff;
}

.bg-000 {
    background-color: #000;
}

.bg-pink {
    background-color: pink;
}

/* 渐变 */
.bg-linear {
    background-image: linear-gradient(transparent,
            rgba(0, 0, 0, 0.6));
}